Wednesday marks Joe Biden's first day as US president, but you're going to hear a lot about his first 100 days as he takes the reins, particularly when it comes to Covid.
That gets us to April 30.
The list of what Biden hopes to do between now and then, in part:

    Asking Americans to wear masks (and making them, where he can)
    100 million vaccines in American arms
    Most US schools open
    Passing a $1.9 trillion economic relief plan
    Introducing a new immigration proposal with a pathway to citizenship

He's also got a slate of Day One executive orders meant to undo what President Donald Trump has wrought over the past four years, including:

    Rejoining the Paris climate agreement
    Nixing Trump's travel ban on mostly-Muslim countries
    Stopping the Keystone XL pipeline

Here's a full list.
That will be followed by executive orders on Thursday and Friday regarding Covid and economic support for Americans.
Biden's also pledged the most diverse Cabinet in history and said it would look like America. Here's an interactive that shows how he did.
Biden will be tackling this enormous to-do list as Congress navigates the impeachment trial of his predecessor (which may or may not feature Chief Justice John Roberts).
It's a lot to get done in 100 days, far less than an NBA season, particularly when you pair it with the fact that the Senate has not confirmed or even scheduled a vote on a single one of Biden's Cabinet nominees. The first group had their initial hearings on Tuesday.